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Why did they age so fast in Old? The movie's shocking truth

In the unsettling M. Night Shyamalan film *Old*, visitors to a secluded beach mysteriously find their lives compressed into a single day, with their bodies aging at an accelerated rate. This horrific premise leaves viewers with a single, urgent question: **why did they age so fast in Old?** This guide breaks down the dark scientific and conspiratorial reasons behind the phenomenon.